John fttllerton palmer



(No Model.)

J. 1-". PALMER.

BLAGKBOARD BRASER.

No. 412,116. Patented Oct. 1, 1889.

' SW M u. FETELRS. mmuw w. WnhingtomllC.

UNITED STATES PATENT rricE.

JOHN FULLERTON PALMER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THOMAS KANE, OF SAME PLACE.

BLACKBOARD-ERASER.

SPECIFICATION forming part of Letters 'Patent No. 412,116, dated October 1, 1889. Application filed May 16, 1889. Serial No. 311,011. (No model.)

To all whom it nut/y concern:

Be it known that 1, JOHN FULLERTON PALMER, of Chicago, in the county of Cook and State of Illinois, have invented certain Improvements in Blackboard-Erasers, of which the following is a specification.

The aim of my invention is to provide a cheap and efficient eraser the wearing-surface of which may be readily renewed at a trifling cost and without the employment of tools or skilled labor.

In the accompanying drawings, Figure 1 is a perspective view of my eraser. Fig. 2 is a cross-section of the same on the line as 00. Fig.

:5 3 is a perspective view of the erasive material as prepared for application to the handle or body.

Referring to the drawings, A represents a body or handle, made preferably of wood, in

the form shown or similar form presenting a fiat surface to receive the erasive material.

B represents the erasive material secured to the face of the body. I prefer to use a heavy and tenacious felt, and to provide the same with numerous small perforations b. In practice it is found that these perforations serving as cells to retain the chalk are very advantageous, as they prevent the body of the material from being overloaded with the chalk, leave the surface in better operative condition, and admit of the chalk being readily discharged by sharply rapping the eraser. The cells are advantageous not only in felt, but also in cloth, chamOisskin, and other ma- 3 5 terials used in erasers.

The perforated fabric may be secured to the body in any suitable manner; but in order to hold it firmly in place and admit of its being replaced by new material I prefer to cement the felt firmly to a backin -sheet G,

- of paper or like material, and to unite the latter in turn to the face of the block by glue or other adhesive soluble in water, so that it may be readily soaked loose.

I propose to place the erasive material with its paper backing coated 011 the back with the soluble adhesive in the form shown in Fig. 3 on the market as an article of commerce, so that the purchaser has only to moisten the adhesive and press the same against the surface of the body or handle to efiect a secure union of the parts.

Having thus described my invention, what I claim is 1. In a blackboard-erasen the combination 5 5 

